 /*******************************************************************************
  * Copyright (c) 2005, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.osgi.baseadaptor.loader;

 import java.security.ProtectionDomain ;
 import org.eclipse.osgi.baseadaptor.bundlefile.BundleFile;
 import org.eclipse.osgi.framework.util.KeyedElement;
 import org.eclipse.osgi.framework.util.KeyedHashSet;

 /**
  * A ClasspathEntry contains a single <code>BundleFile</code> which is used as
  * a source to load classes and resources from, and a single
  * <code>ProtectionDomain</code> which is used as the domain to define classes
  * loaded from this ClasspathEntry.
  * @since 3.2
  */
 public class ClasspathEntry {
     private BundleFile bundlefile;
     private ProtectionDomain domain;
     private KeyedHashSet userObjects = null;

     /**
      * Constructs a ClasspathElement with the specified bundlefile and domain
      * @param bundlefile A BundleFile object which acts as a source
      * @param domain the ProtectDomain for all code loaded from this classpath element
      */
     public ClasspathEntry(BundleFile bundlefile, ProtectionDomain domain) {
         this.bundlefile = bundlefile;
         this.domain = domain;
     }

     /**
      * Returns the source BundleFile for this classpath entry
      * @return the source BundleFile for this classpath entry
      */
     public BundleFile getBundleFile() {
         return bundlefile;
     }

     /**
      * Returns the ProtectionDomain for this classpath entry
      * @return the ProtectionDomain for this classpath entry
      */
     public ProtectionDomain getDomain() {
         return domain;
     }

     /**
      * Returns a user object which is keyed by the specified key
      * @param key the key of the user object to get
      * @return a user object which is keyed by the specified key
      */
     public Object getUserObject(Object key) {
         if (userObjects == null)
             return null;
         synchronized (userObjects) {
             return userObjects.getByKey(key);
         }
     }

     /**
      * Adds a user object
      * @param userObject the user object to add
      */
     public synchronized void addUserObject(KeyedElement userObject) {
         if (userObjects == null)
             userObjects = new KeyedHashSet(5, false);
         synchronized (userObjects) {
             userObjects.add(userObject);
         }
     }
 }

